DE112007001725B4 - SOI device and method for its production - Google Patents
SOI device and method for its production Download PDFInfo
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- H—ELECTRICITY
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0255—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using diodes as protective elements
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/74—Making of localized buried regions, e.g. buried collector layers, internal connections substrate contacts
- H01L21/743—Making of internal connections, substrate contacts
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/84—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being other than a semiconductor body, e.g. being an insulating body
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
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- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1203—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body the substrate comprising an insulating body on a semiconductor body, e.g. SOI
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Abstract
Verfahren zur Herstellung eines Halbleiter-auf-Isolator-(SOI)-Bauelements (53), das ein Halbleitersubstrat (34), eine vergrabene isolierende Schicht (32) über dem Halbleitersubstrat und eine monokristalline Halbleiterschicht (30) über der vergrabenen isolierenden Schicht aufweist, wobei das Verfahren die Schritte umfasst:
Bilden eines MOS-Kondensators (52), der zwischen einer ersten Spannungsbusleitung (100) und einer zweiten Spannungsbusleitung (102) angeschlossen ist, wobei der MOS-Kondensator ein Gate-Elektrodenmaterial aufweist, das eine erste Platte (64) des MOS-Kondensators bildet und mit der ersten Spannungsbusleitung (100) verbunden ist, und ein dotiertes Gebiet (60) in der monokristallinen Halbleiterschicht unter dem Gate-Elektrodenmaterial aufweist, das eine zweite Platte des MOS-Kondensators bildet und mit der zweiten Spannungsbusleitung (102) verbunden ist; und
Bilden eines elektrischen Entladungspfades (86, 98, 180, 178), der die erste Platte (64) des MOS-Kondensators (52) mit einer Diode (177), die in dem Halbleitersubstrat (34) gebildet ist, verbindet.A method of fabricating a semiconductor on insulator (SOI) device (53) having a semiconductor substrate (34), a buried insulating layer (32) over the semiconductor substrate, and a monocrystalline semiconductor layer (30) over the buried insulating layer, the method comprising the steps of:
Forming a MOS capacitor (52) connected between a first voltage bus line (100) and a second voltage bus line (102), the MOS capacitor having a gate electrode material forming a first plate (64) of the MOS capacitor and connected to the first voltage bus line (100) and having a doped region (60) in the monocrystalline semiconductor layer under the gate electrode material forming a second plate of the MOS capacitor and connected to the second voltage bus line (102); and
Forming an electrical discharge path (86, 98, 180, 178) connecting the first plate (64) of the MOS capacitor (52) to a diode (177) formed in the semiconductor substrate (34).
Description
TECHNISCHES GEBIETTECHNICAL AREA
Die vorliegende Erfindung betrifft im Allgemeinen ein Halbleiter-auf-Isolator-(SOI)Bauelement und betrifft Verfahren zur Herstellung eines derartigen Bauelements und betrifft insbesondere SOI-Bauelemente und Verfahren zur Herstellung von SOI-Bauelementen mit einem Entladungspfad für einen Entkopplungskondensator.The present invention generally relates to a semiconductor-on-insulator (SOI) device and relates to methods of making such a device, and more particularly relates to SOI devices and methods of fabricating SOI devices having a discharge path for a decoupling capacitor.
HINTERGRUNDBACKGROUND
Die Mehrheit der aktuellen integrierten Schaltungen (ICs) wird hergestellt durch Anwendung einer Vielzahl von miteinander verbundenen Feldeffekttransistoren (FETs), die auch als Metall-Oxid-Halbleiter-Feldeffekttransistoren (MOSFET oder MOS-Transistoren) bezeichnet werden. Die ICs werden für gewöhnlich unter Anwendung von sowohl P-Kanal-FETs (PMOS-Transistoren oder PFETS) als auch N-Kanal-FETS (NMOS-Transistoren oder NFETs) hergestellt, und das IC wird dann als eine komplementäre MOS- oder CMOS-Schaltung bezeichnet. Gewisse Verbesserungen im Leistungsverhalten der MOS-ICs können verwirklicht werden, indem die MOS-Transistoren in einer dünnen Schicht aus Halbleitermaterial hergestellt werden, die über einer Isolatorschicht liegt. Derartige Halbleiter-auf-Isolator-(SOI)MOS-Transistoren weisen beispielsweise eine geringere PN-Übergangskapazität und damit eine höhere Arbeitsgeschwindigkeit auf.The majority of current integrated circuits (ICs) are made by using a plurality of interconnected field effect transistors (FETs), also referred to as metal oxide semiconductor field effect transistors (MOSFETs or MOS transistors). The ICs are typically fabricated using both P-channel FETs (PMOS transistors or PFETs) and N-channel FETs (NMOS transistors or NFETs), and the IC is then implemented as a complementary MOS or CMOS device. Designated circuit. Certain improvements in the performance of the MOS ICs can be realized by making the MOS transistors in a thin layer of semiconductor material overlying an insulator layer. Such semiconductor-on-insulator (SOI) MOS transistors have, for example, a lower PN junction capacitance and thus a higher operating speed.
Die MOS-Transistoren, die in und auf der SOI-Schicht hergestellt sind, sind miteinander verbunden, um die gewünschte Schaltungsfunktion zu verwirklichen. Es sind auch eine Reihe von Spannungsbusleitungen mit geeigneten Bauelementen verbunden, um diese Bauelemente entsprechend der Schaltungsfunktion zu versorgen. Die Spannungsbusleitungen enthalten beispielsweise einen Vdd-Bus, einen Vcc-Bus, einen Vss-Bus und dergleichen, und können auch Busleitungen aufweisen, die mit externen Versorgungsspannungen verbunden sind, sowie Busleitungen, die mit intern erzeugten oder intern geänderten Versorgungsspannungsquellen verbunden sind. Im hierin verwendeten Sinne bezeichnen die Begriffe ”Vdd-Bus” und ”Vcc-Bus” sowie ”Spannungsbus bzw. Spannungsbusleitung” und dergleichen externe sowie interne Busse bzw. Busleitungen. Da diverse Schaltungsknoten in der Schaltung aufgeladen oder entladen werden während des Betriebs der Schaltung, müssen die diversen Busleitungen Strom in diese Schaltungsknoten einspeisen oder davon aufnehmen. Insbesondere, wenn die Schaltgeschwindigkeit der integrierten Schaltungen anwächst, kann das Erfordernis des Einspeisens oder Aufnehmens von Strom durch einen Bus zu deutlichen Spannungsspitzen auf der Busleitung aufgrund der inhärenten Induktivität der Busleitung führen. Es ist daher eine übliche Praxis, Entkopplungskondensatoren zwischen den Busleitungen anzuordnen, um Logikfehler zu vermeiden, die durch die Spannungsspitzen hervorgerufen werden könnten. Beispielsweise sind derartige Entkopplungskondensatoren zwischen der Vdd-Busleitung und der Vss-Busleitung angeordnet. Diese Entkopplungskondensatoren sind typischerweise entlang der gesamten Länge der Busleitungen verteilt. Die Kondensatoren sind üblicherweise aber nicht notwendigerweise als MOS-Kondensatoren ausgebildet, wobei eine Kondensatorplatte des Kondensators aus dem gleichen Material hergestellt ist, das zur Herstellung der Gate-Elektrode der MOS-Transistoren verwendet wird, während die andere Platte des Kondensators aus einem dotierten Gebiet in der SOI-Schicht aufgebaut ist, und wobei das die beiden Elektroden trennende Dielektrikum des Kondensators durch das Gate-Dielektrikum gebildet ist.The MOS transistors fabricated in and on the SOI layer are connected together to realize the desired circuit function. A number of voltage bus lines are also connected to suitable components to supply these components according to the circuit function. The voltage bus lines include, for example, a V dd bus, a V cc bus, a V ss bus, and the like, and may also include bus lines connected to external supply voltages and bus lines connected to internally generated or internally changed supply voltage sources , As used herein, the terms "V dd bus" and "V cc bus" as well as "voltage bus" and the like refer to external as well as internal buses. Since various circuit nodes in the circuit are being charged or discharged during operation of the circuit, the various bus lines must feed or receive current into these circuit nodes. In particular, as the switching speed of the integrated circuits increases, the need to inject or receive current through a bus can result in significant voltage spikes on the bus due to the inherent inductance of the bus. It is therefore a common practice to place decoupling capacitors between the bus lines to avoid logic errors that might be caused by the voltage spikes. For example, such decoupling capacitors are arranged between the V dd bus line and the V ss bus line. These decoupling capacitors are typically distributed along the entire length of the bus lines. However, the capacitors are usually not necessarily formed as MOS capacitors, wherein a capacitor plate of the capacitor is made of the same material that is used to make the gate of the MOS transistors, while the other plate of the capacitor from a doped region in the SOI layer is constructed, and wherein the dielectric separating the two electrodes of the capacitor is formed by the gate dielectric.
In der
In der
Ein Problem, das die Ausbeute und die Zuverlässigkeit der integrierten Schaltung beeinflussen kann, kann auftreten, wenn derartige MOS-Kondensatoren als Entkopplungskondensatoren zwischen den Spannungsbusleitungen verwendet werden. Die Problematik tritt auf, da sich während der Herstellung des ICs eine ausgeprägte Ladung auf einem Kondensator ansammeln kann, so dass eine schädigende Entladung über das Kondensator-Dielektrikumsmaterial auftreten kann. Diese Problematik tritt noch stärker zutage, wenn die Bauteilstrukturgrößen abnehmen und insbesondere, wenn die Dicke der Gate-Dielektrikumsschicht reduziert ist. Der Ladungsaufbau ergibt sich durch einen oder mehrere Plasmaabscheide- und/oder Ätzschritte, die verwendet werden, um dielektrische Zwischenschichtmaterialien und die Metalle oder andere leitende Materialien, die in den abschließenden Schritten der Herstellung der integrierten Schaltung verwendet werden, abzuscheiden und/oder zu ätzen.A problem that may affect the yield and reliability of the integrated circuit may occur when such MOS capacitors are used as decoupling capacitors between the voltage bus lines. The problem arises because during the fabrication of the IC, a pronounced charge can accumulate on a capacitor, so that a damaging discharge can occur across the capacitor dielectric material. This problem is even more evident as the device structure sizes decrease, and particularly as the thickness of the gate dielectric layer is reduced. The charge buildup results from one or more plasma deposition and / or etching steps used to deposit and / or etch dielectric interlayer materials and the metals or other conductive materials used in the final steps of the integrated circuit fabrication.
Daher ist es wünschenswert, ein MOS-Bauelement und Verfahren zur Herstellung derartiger MOS-Bauelemente bereitzustellen, die die schädigende Wirkung der Ladungsansammlung in Entkopplungskondensatoren vermeiden. Des Weiteren ist es eine Aufgabe, Verfahren zur Herstellung eines SOI-Bauelements bereitzustellen, in denen Entkopplungskondensatoren und ein Entladungspfad zum Schutz der Entkopplungskondensatoren vorgesehen werden. Andere vorteilhafte Merkmale und Eigenschaften der vorliegenden Erfindung gehen aus der folgenden detaillierten Beschreibung und den angefügten Patentansprüchen hervor, wenn diese in Verbindung mit den begleitenden Zeichnungen und dem vorhergehenden technischen Gebiet und dem Hintergrund studiert werden.Therefore, it is desirable to provide a MOS device and methods of manufacturing such MOS devices that avoid the damaging effect of charge accumulation in decoupling capacitors. Furthermore is It is an object to provide methods for fabricating an SOI device in which decoupling capacitors and a discharge path for protecting the decoupling capacitors are provided. Other advantageous features and characteristics of the present invention will become apparent from the following detailed description and the appended claims, taken in conjunction with the accompanying drawings and the foregoing technical field and background.
KURZER ÜBERBLICK ÜBER DIE ERFINDUNGBRIEF SUMMARY OF THE INVENTION
Es wird ein Silizium-auf-Isolator-(SOI)Bauelement nach Anspruch 4 bereitgestellt, das einen MOS-Kondensator aufweist, der zwischen Spannungsbusleitungen angeschlossen ist und der in einer monokristallinen Halbleiterschicht, die über einer Isolatorschicht und einem Halbleitersubstrat angeordnet ist, hergestellt ist. Das Bauelement umfasst mindestens einen elektrischen Entladungspfad zum Entladen einer potenziell schädigenden Ladungsansammlung auf dem MOS-Kondensator. Der MOS-Kondensator besitzt ein leitendes Elektrodenmaterial, das eine erste Platte des MOS-Kondensators bildet, und ein dotiertes Gebiet in der monokristallinen Siliziumschicht unterhalb des leitenden Elektrodenmaterials, das eine zweite Platte bildet. Eine erste Spannungsbusleitung ist mit der ersten Platte des Kondensators und mit einem elektrischen Entladungspfad über eine Diode, die in dem Halbleitersubstrat gebildet ist, verbunden. Eine zweite Spannungsbusleitung ist mit der zweiten Platte des Kondensators verbunden.There is provided a silicon on insulator (SOI) device according to claim 4 comprising a MOS capacitor connected between voltage bus lines and fabricated in a monocrystalline semiconductor layer disposed over an insulator layer and a semiconductor substrate. The device includes at least one electrical discharge path for discharging a potentially damaging charge accumulation on the MOS capacitor. The MOS capacitor has a conductive electrode material forming a first plate of the MOS capacitor and a doped region in the monocrystalline silicon layer below the conductive electrode material forming a second plate. A first voltage bus line is connected to the first plate of the capacitor and to an electric discharge path via a diode formed in the semiconductor substrate. A second voltage bus line is connected to the second plate of the capacitor.
Es wird ein Verfahren nach Anspruch 1 zur Herstellung eines Silizium-auf-Isolator-(SOI)Bauelements bereitgestellt, das ein Siliziumsubstrat, eine vergrabene isolierende Schicht über dem Siliziumsubstrat und eine monokristalline Siliziumschicht über der vergrabenen isolierenden Schicht aufweist.There is provided a method of manufacturing a silicon on insulator (SOI) device comprising a silicon substrate, a buried insulating layer over the silicon substrate, and a monocrystalline silicon layer over the buried insulating layer.
KURZE BESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS
Die vorliegende Erfindung wird im Weiteren in Verbindung mit den folgenden Zeichnungen beschrieben, wobei gleiche Bezugszeichen gleiche Elemente bezeichnen, und wobei:The present invention will be further described in conjunction with the following drawings, wherein like numerals denote like elements, and wherein:
DETAILLIERTE BESCHREIBUNGDETAILED DESCRIPTION
Wie in
Als eine Alternative zu Scheibenverbindungstechniken kann das monokristalline Halbleitersubstrat
Nach dem Bereitstellen eines Halbleitersubstrats
Gemäß einer Ausführungsform der Erfindung kann der Bereich
Wie in
Wie ebenfalls in
Vor oder nach der Implantation der Ionen, die eine P-Leitfähigkeit hervorrufen, durch die Öffnung
Nach dem Entfernen der maskierenden Fotolackschicht werden die freiliegenden Bereiche der Isolatorschicht
Gemäß einer Ausführungsform der Erfindung wird ein dielektrisches Zwischenschichtmaterial
Wie in den
Wie in
Wie in
Wie in
Der Vdd-Bus ist mit dem leitenden Pfropfen
Zumindest für einige der MOS-Transistoren der integrierten Schaltung
Obwohl zumindest eine anschauliche Ausführungsform in der vorhergehenden detaillierten Beschreibung dargelegt ist, sollte beachtet werden, dass eine große Anzahl Änderungen möglich ist. Beispielsweise ist die Reihenfolge der zuvor beschriebenen Verfahrensschritte lediglich anschaulicher Natur. In ähnlicher Weise sind die aufgeführten Metalle, Isolatoren und Ionensorten lediglich anschaulicher Natur. Obwohl der Vdd-Bus und der Vss-Bus in den
Claims (7)
Applications Claiming Priority (3)
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US11/459,316 | 2006-07-21 | ||
US11/459,316 US7718503B2 (en) | 2006-07-21 | 2006-07-21 | SOI device and method for its fabrication |
PCT/US2007/016453 WO2008011144A1 (en) | 2006-07-21 | 2007-07-20 | Soi device and method for its fabrication |
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DE112007001725T5 DE112007001725T5 (en) | 2009-06-10 |
DE112007001725B4 true DE112007001725B4 (en) | 2013-10-17 |
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DE112007001725T Expired - Fee Related DE112007001725B4 (en) | 2006-07-21 | 2007-07-20 | SOI device and method for its production |
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US (2) | US7718503B2 (en) |
JP (1) | JP2009545162A (en) |
KR (1) | KR20090042252A (en) |
CN (1) | CN101512764B (en) |
DE (1) | DE112007001725B4 (en) |
GB (1) | GB2453487B (en) |
TW (1) | TWI433305B (en) |
WO (1) | WO2008011144A1 (en) |
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US7718503B2 (en) | 2010-05-18 |
KR20090042252A (en) | 2009-04-29 |
CN101512764A (en) | 2009-08-19 |
GB0901334D0 (en) | 2009-03-11 |
CN101512764B (en) | 2013-01-09 |
US20080017906A1 (en) | 2008-01-24 |
TW200822347A (en) | 2008-05-16 |
TWI433305B (en) | 2014-04-01 |
JP2009545162A (en) | 2009-12-17 |
WO2008011144A1 (en) | 2008-01-24 |
US7915658B2 (en) | 2011-03-29 |
GB2453487B (en) | 2009-12-30 |
US20100187586A1 (en) | 2010-07-29 |
DE112007001725T5 (en) | 2009-06-10 |
GB2453487A (en) | 2009-04-08 |
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